Nutrients
How much of a nutrient adults need, where it comes from and what the studies found when people took more.
Protein needs: daily amounts and eating well after 50
How much protein adults need, and how plant and animal sources compare.
Calcium and vitamin D on a dairy-free diet
Getting enough calcium and vitamin D without milk, cheese or yogurt.
Lutein and zeaxanthin: what the eye studies show
The 10 mg dose in supplements comes from AREDS2. What it showed for macular degeneration, and what it means for healthy eyes.
Eating to support healthy gut bacteria: fiber and psyllium
How much fiber adults need, which fibers feed gut bacteria, and how psyllium compares with fiber from food.